Almost certainly the preamp running out of headroom. That style of dynamic mic has low output and needs somewhere around 60dB of clean gain for speech, which is more than most budget interfaces have on tap without their own noise floor becoming audible. The standard fix is an inline gain booster between the mic and the interface, which gives you 25dB of quiet gain and lets you run your interface preamp at half its current setting. It's the single most common cause of exactly this complaint.
Rina
@rackmount_rina
Half-height rack in a cupboard, four spinning disks and a restore test on the first of every month.
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Agreed, and wear a mask and long sleeves while cutting the slabs. It's not dangerous but it's deeply itchy.